LED tube lamp
DC CAFCFirst Claim
1. A light emitting diode (LED) tube lamp, comprising:
- a lamp tube;
a first pin and a second pin coupled to a first end of the lamp tube, and a third pin coupled to a second end of the lamp tube;
a first rectifying circuit comprising diodes and connected to the first and second pins, and a second rectifying circuit comprising diodes and connected to the third pin and an output terminal of the first rectifying circuit, wherein the first and second rectifying circuits are for rectifying an external driving signal to produce a rectified signal;
a filtering circuit coupled to the two rectifying circuits and an LED module, for filtering the rectified signal to produce a filtered signal;
an LED module comprising LEDs for emitting light, the LED module configured to be driven by the rectified signal or the filtered signal; and
a driving circuit coupled between the two rectifying circuits and the LED module, and configured to drive the LED module,wherein the LED tube lamp is configured to receive the external driving signal and emit light in each of two power supply arrangements, the two arrangements being respectively that the external driving signal is a low frequency signal input and transmitted through the first and second pins, and that the external driving signal is a low frequency signal input and transmitted through one of the first and second pins and the third pin across the two ends of the lamp tube;
wherein the LED tube lamp is configured such that when the received external driving signal is a low frequency signal, the LED tube lamp causes the rectified signal or the filtered signal to be used by the driving circuit for driving the LED module to emit light; and
wherein the LED tube lamp is configured such that the driving circuit does not drive the LED module to emit light, when an external driving signal input through one of the first and second pins and the third pin across the two ends of the lamp tube is provided by an electrical ballast.
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Abstract
A light emitting diode (LED) tube lamp includes a lamp tube; a first pin and a second pin coupled to a first end of the lamp tube, and a third pin coupled to a second end of the lamp tube; a first rectifying circuit comprising diodes and connected to the first and second pins, and a second rectifying circuit comprising diodes and connected to the third pin and an output terminal of the first rectifying circuit; a filtering circuit coupled to the two rectifying circuits and the LED module, for filtering the rectified signal to produce a filtered signal; an LED module comprising LEDs for emitting light, the LED module configured to be driven by the rectified signal or the filtered signal; and a driving circuit coupled between the two rectifying circuits and the LED module, and configured to drive the LED module. The LED tube lamp is configured to receive the external driving signal and emit light in each of two power supply arrangements, the two arrangements being respectively that the external driving signal is a low frequency signal input and transmitted through the first and second pins, and that the external driving signal is a low frequency signal input and transmitted through one of the first and second pins and the third pin across the two ends of the lamp tube. The LED tube lamp is configured such that when the received external driving signal is a low frequency signal, the LED tube lamp causes the rectified signal or the filtered signal to be used by the driving circuit for driving the LED module to emit light.
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Citations
51 Claims
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1. A light emitting diode (LED) tube lamp, comprising:
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a lamp tube; a first pin and a second pin coupled to a first end of the lamp tube, and a third pin coupled to a second end of the lamp tube; a first rectifying circuit comprising diodes and connected to the first and second pins, and a second rectifying circuit comprising diodes and connected to the third pin and an output terminal of the first rectifying circuit, wherein the first and second rectifying circuits are for rectifying an external driving signal to produce a rectified signal; a filtering circuit coupled to the two rectifying circuits and an LED module, for filtering the rectified signal to produce a filtered signal; an LED module comprising LEDs for emitting light, the LED module configured to be driven by the rectified signal or the filtered signal; and a driving circuit coupled between the two rectifying circuits and the LED module, and configured to drive the LED module, wherein the LED tube lamp is configured to receive the external driving signal and emit light in each of two power supply arrangements, the two arrangements being respectively that the external driving signal is a low frequency signal input and transmitted through the first and second pins, and that the external driving signal is a low frequency signal input and transmitted through one of the first and second pins and the third pin across the two ends of the lamp tube; wherein the LED tube lamp is configured such that when the received external driving signal is a low frequency signal, the LED tube lamp causes the rectified signal or the filtered signal to be used by the driving circuit for driving the LED module to emit light; and wherein the LED tube lamp is configured such that the driving circuit does not drive the LED module to emit light, when an external driving signal input through one of the first and second pins and the third pin across the two ends of the lamp tube is provided by an electrical ballast. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 46, 47, 48, 49)
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21. A light emitting diode (LED) tube lamp, comprising:
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a lamp tube; a first pin and a second pin coupled to a first end of the lamp tube, and a third pin coupled to a second end of the lamp tube; a first rectifying circuit comprising diodes and connected to the first and second pins, and a second rectifying circuit comprising diodes and connected to the third pin and an output terminal of the first rectifying circuit, wherein the first and second rectifying circuits are for rectifying an external driving signal to produce a rectified signal; a filtering circuit coupled to the two rectifying circuits and an LED module, for filtering the rectified signal to produce a filtered signal; an LED module comprising LEDs for emitting light, the LED module configured to be driven by the rectified signal or the filtered signal; a driving circuit coupled between the two rectifying circuits and the LED module, and configured to drive the LED module; and a detection module coupled to the two rectifying circuits for protecting a user from electric shock, having two detection terminals, and configured to not conduct current between the two detection terminals when the external driving signal is input at the first and second pins, wherein the LED tube lamp is configured to receive an external driving signal in a power supply arrangement in which the external driving signal is input and transmitted through the third pin and one of the first and second pins across the two ends of the lamp tube; wherein the detection module includes a switch circuit coupled between the two detection terminals, configured to be in a conducting state when the LED tube lamp receives an external driving signal input and transmitted through the third pin and one of the first and second pins across the two ends of the lamp tube; and wherein the switch circuit is connected between the third pin and one of the first and second pins;
the second rectifying circuit comprises two serially-connected diodes, and a common node between the two diodes is connected to the third pin and a first terminal of the switch circuit; and
the first rectifying circuit comprises two other serially-connected diodes, and a common node between the two other diodes is connected to both a second terminal of the switch circuit and the first or second pin. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 43, 44, 45, 50)
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34. A light emitting diode (LED) tube lamp, comprising:
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a lamp tube; a first pin and a second pin coupled to a first end of the lamp tube, and a third pin coupled to a second end of the lamp tube; a first rectifying circuit comprising diodes and connected to the first and second pins, and a second rectifying circuit comprising diodes and connected to the third pin and an output terminal of the first rectifying circuit, wherein the first and second rectifying circuits are for rectifying an external driving signal to produce a rectified signal; a filtering circuit coupled to the two rectifying circuits and an LED module, for filtering the rectified signal to produce a filtered signal; an LED module comprising LEDs for emitting light, the LED module configured to be driven by the rectified signal or the filtered signal; and a driving circuit coupled between the two rectifying circuits and the LED module, and configured to drive the LED module, wherein the LED tube lamp is configured to receive the external driving signal and emit light in each of two power supply arrangements, the two arrangements being respectively that the external driving signal is a signal having a frequency between 40 and 60 Hz input and transmitted through the first and second pins, and that the external driving signal is a signal having a frequency between 40 and 60 Hz input and transmitted through one of the first and second pins and the third pin across the two ends of the lamp tube; wherein the LED tube lamp is configured such that when the received external driving signal is a signal having a frequency between 40 and 60 Hz, the LED tube lamp causes the rectified signal or the filtered signal to be used by the driving circuit for driving the LED module to emit light, and wherein the LED tube lamp is configured such that the driving circuit does not drive the LED module to emit light, when an external driving signal input through one of the first and second pins and the third pin across the two ends of the lamp tube is provided by an electrical ballast. - View Dependent Claims (35, 36, 37, 38, 39, 51)
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40. A light emitting diode (LED) tube lamp, comprising:
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a lamp tube; a first pin and a second pin coupled to a first end of the lamp tube, and a third pin coupled to a second end of the lamp tube; a first rectifying circuit comprising diodes and connected to the first and second pins, and a second rectifying circuit comprising diodes and connected to the third pin and an output terminal of the first rectifying circuit, wherein the first and second rectifying circuits are for rectifying an external driving signal to produce a rectified signal; a filtering circuit coupled to the two rectifying circuits and an LED module, for filtering the rectified signal to produce a filtered signal; an LED module comprising LEDs for emitting light, the LED module configured to be driven by the rectified signal or the filtered signal; a driving circuit coupled between the two rectifying circuits and the LED module, and configured to drive the LED module; and a detection module coupled to the two rectifying circuits for protecting a user from electric shock, having two detection terminals, and configured to not conduct current between the two detection terminals when the external driving signal is input at the first and second pins, wherein the detection module includes a switch circuit coupled between the two detection terminals and configured to be in a conducting state when the LED tube lamp receives an external driving signal input and transmitted through the third pin and one of the first and second pins across the two ends of the lamp tube, wherein the LED tube lamp is configured to receive an external driving signal in a power supply arrangement in which the external driving signal is input and transmitted through the third pin and one of the first and second pins across the two ends of the lamp tube; the LED tube lamp further comprising a ballast-compatible circuit connected between the third pin and one of the first and second pins, wherein the ballast-compatible circuit comprises the switch circuit, and the switch circuit is configured to be in a conducting state when the LED tube lamp receives an external driving signal from an electrical ballast; and
upon the LED tube lamp receiving an external driving signal from an electrical ballast, the switch circuit initially conducts current bypassing the LED module and between the third pin and one of the first and second pins, causing then a current to flow between the third pin and one of the first and second pins through the first and second rectifying circuits, the driving circuit, and the LED module for emitting light. - View Dependent Claims (41, 42)
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Specification